99942 Apophis (2004 MN4)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.1911663196 ± 2.00e+00
Semi-major axis (a)0.9223804710 AU ± 3.00e+00
Inclination (i)3.34095673° ± 4.00e+00
Long. of Asc. Node (Ω)203.89962943° ± 5.00e+00
Arg. of Perihelion (ω)126.67282559° ± 6.00e+00
Mean Anomaly (M)312.80548085° ± 2.46e-06
Mean Motion (n)1.1126206784°/day ± 5.43e+00
Perihelion dist (q)0.74605239 AU ± 3.05e+00
Aphelion dist (Q)1.09870855 AU ± 4.02e+00
Orbital Period0.88586012 yr ± 4.32e+00
NGA Modelr2
A1-3.03172826e-03 AU/d²
A2-2.37461812e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.00
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-29
RMS Residual0.213″
Uncertainty0
Orbit TypeAten
MOID0.000007 AU
Observations Used8720
Oppositions2
Arc Total2004-2021
First Observation Used2004-03-15
Last Observation Used2021-05-20
Observations (10797)
Date Type RA Dec Mag Band Observatory
2021-03-09 02:47:29 C 09 13 31.93 -05 10 04.2 V W50
2021-03-09 02:50:09 C 09 13 31.41 -05 09 58.7 V W50
2021-03-09 02:51:38 C 09 13 31.15 -05 09 56.0 V W50
2021-03-09 02:53:07 C 09 13 30.87 -05 09 52.9 V W50
2021-03-09 02:54:35 C 09 13 30.55 -05 09 49.7 V W50
2021-03-09 02:56:13 C 09 13 30.25 -05 09 46.4 V W50
2021-03-09 02:59:15 C 09 13 29.69 -05 09 40.5 V W50
2021-03-09 03:00:44 C 09 13 29.42 -05 09 37.5 V W50
2021-03-09 03:02:47 C 09 13 28.98 -05 09 33.2 V W50
2021-03-09 03:05:37 C 09 13 28.48 -05 09 27.5 V W50
2021-03-09 03:07:10 C 09 13 28.20 -05 09 24.4 V W50
2021-03-09 03:08:38 C 09 13 27.89 -05 09 21.4 V W50
2021-03-09 03:10:21 C 09 13 27.55 -05 09 18.0 V W50
2021-03-09 03:11:57 C 09 13 27.26 -05 09 14.7 V W50
2021-03-09 03:13:32 C 09 13 26.93 -05 09 11.3 V W50
2021-03-09 03:15:42 C 09 13 26.56 -05 09 07.2 V W50
2021-03-09 03:17:11 C 09 13 26.27 -05 09 04.1 V W50
2021-03-09 03:18:38 C 09 13 25.98 -05 09 01.1 V W50
2021-03-09 14:25:48 C 09 11 33.71 -04 46 40.9 V N82
2021-03-09 14:48:08 C 09 11 29.63 -04 45 55.7 V N82
2021-03-09 15:10:28 C 09 11 25.56 -04 45 10.6 V N82
2021-03-09 16:28:28 C 09 11 13.41 -04 42 05.5 q C97
2021-03-09 16:29:10 C 09 11 13.28 -04 42 04.1 q C97
2021-03-09 16:29:53 C 09 11 13.15 -04 42 02.7 q C97
2021-03-09 16:30:34 C 09 11 13.01 -04 42 01.3 q C97
2021-03-09 16:31:16 C 09 11 12.89 -04 41 59.8 q C97
2021-03-09 16:31:59 C 09 11 12.75 -04 41 58.3 q C97
2021-03-09 16:32:41 C 09 11 12.63 -04 41 57.0 q C97
2021-03-09 16:33:23 C 09 11 12.54 -04 41 55.6 q C97
2021-03-09 17:14:33 C 09 11 05.86 -04 40 53.5 V 094
2021-03-09 17:31:25 C 09 11 01.72 -04 39 58.8 q M44
2021-03-09 17:43:10 C 09 11 00.64 -04 39 55.8 V 094
2021-03-09 17:44:21 C 09 10 59.34 -04 39 32.9 q M44
2021-03-09 17:55:26 C 09 10 58.38 -04 39 31.1 V 094
2021-03-09 17:58:31 C 09 10 57.82 -04 39 24.9 V 094
2021-03-09 18:02:25 C 09 10 55.91 -04 38 56.4 q M44
2021-03-09 20:38:23 C 09 10 28.96 -04 34 09.1 u 152
2021-03-09 20:40:33 C 09 10 28.56 -04 34 04.6 o 152
2021-03-09 20:41:35 C 09 10 28.38 -04 34 02.8 o 152
2021-03-09 20:42:38 C 09 10 28.19 -04 34 00.5 u 152
2021-03-09 20:43:40 C 09 10 27.99 -04 33 58.3 u 152
2021-03-09 20:44:41 C 09 10 27.82 -04 33 56.2 u 152
2021-03-09 20:56:07 C 09 10 25.75 -04 33 33.2 u 152
2021-03-09 20:57:09 C 09 10 25.56 -04 33 30.8 u 152
2021-03-09 21:00:26 C 09 10 25.55 -04 33 21.6 V C43
2021-03-09 21:00:40 C 09 10 27.86 -04 32 58.2 V G40
2021-03-09 21:01:59 C 09 10 27.61 -04 32 55.6 V G40
2021-03-09 21:05:25 C 09 10 24.06 -04 33 14.0 u 152
2021-03-09 21:06:27 C 09 10 23.87 -04 33 12.1 o 152
2021-03-09 21:07:30 C 09 10 23.68 -04 33 10.0 o 152
Radar Observations (50)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2005-01-27 23:31:00 -100849.1434 0.25 Hz 2380 -1 -1
2005-01-29 00:00:00 192028507.13 4 us 2380 -1 -1
2005-01-29 00:00:00 -102512.9059 0.25 Hz 2380 -1 -1
2005-01-30 00:18:00 195808170.79 4.5 us 2380 -1 -1
2005-01-30 00:18:00 -103799.8178 0.15 Hz 2380 -1 -1
2005-08-07 17:07:00 8186.8 0.2 Hz 2380 -1 -1
2006-05-06 12:49:00 -118256.8 0.1 Hz 2380 -1 -1
2012-12-21 11:10:00 57992.443 0.25 Hz 8560 -14 -14
2012-12-22 11:00:00 102682986.05 0.25 us 8560 -14 -14
2012-12-22 11:00:00 57880.25 0.1 Hz 8560 -14 -14
2013-01-03 09:20:00 97449107.61 0.25 us 8560 -14 -14
2013-01-03 09:20:00 36629.285 0.1 Hz 8560 -14 -14
2013-01-03 10:00:00 97439308.71 3 us 8560 -14 -14
2013-01-03 10:50:00 97428425.46 0.25 us 8560 -14 -14
2013-01-05 08:40:00 30404.009 0.2 Hz 8560 -14 -14
2013-01-05 10:40:00 96911591.52 0.25 us 8560 -14 -14
2013-01-05 10:40:00 20031.16 0.1 Hz 8560 -14 -14
2013-01-05 10:50:00 96910218.03 3 us 8560 -14 -14
2013-01-06 08:20:00 26660.815 0.1 Hz 8560 -14 -14
2013-01-06 09:30:00 20775.144 0.1 Hz 8560 -14 -14
2013-01-08 08:10:00 15496.441 0.1 Hz 8560 -14 -14
2013-01-09 08:00:00 96451449.73 0.2 us 8560 -14 -14
2013-01-09 08:00:00 9670.119 0.1 Hz 8560 -14 -14
2013-01-09 09:20:00 2690.401 0.1 Hz 8560 -14 -14
2013-01-10 08:00:00 96472652.72 0.2 us 8560 -14 -14
2013-01-10 08:00:00 2590.857 0.1 Hz 8560 -14 -14
2013-01-10 09:40:00 96473924.8 0.2 us 8560 -14 -14
2013-01-11 07:20:00 -1589.599 0.2 Hz 8560 -14 -14
2013-01-14 08:10:00 97258343.56 0.2 us 8560 -14 -14
2013-01-14 08:10:00 -30561.776 0.1 Hz 8560 -14 -14
2013-01-14 09:50:00 97283037.17 0.2 us 8560 -14 -14
2013-01-15 06:30:00 -30666.291 0.1 Hz 8560 -14 -14
2013-01-16 06:30:00 98086754 1 us 8560 -14 -14
2013-01-16 06:30:00 -39582.277 0.2 Hz 8560 -14 -14
2013-01-16 07:50:00 -46641.384 0.1 Hz 8560 -14 -14
2013-01-17 06:20:00 -47875.142 0.1 Hz 8560 -14 -14
2013-02-18 00:56:00 -76760.475 0.2 Hz 2380 -1 -1
2013-02-18 01:37:00 157906444.15 0.25 us 2380 -1 -1
2013-02-18 01:37:00 -78041.365 0.2 Hz 2380 -1 -1
2013-02-19 01:08:00 -78105.657 0.2 Hz 2380 -1 -1
2013-02-20 00:38:00 -78070.341 0.2 Hz 2380 -1 -1
2013-02-20 01:26:00 163578875.87 0.25 us 2380 -1 -1
2013-02-20 01:26:00 -79560.965 0.2 Hz 2380 -1 -1
2013-02-21 01:04:00 -79697.13 0.2 Hz 2380 -1 -1
2013-03-15 23:59:00 235220855.07 2 us 2380 -1 -1
2013-03-15 23:59:00 -80977.5254 0.238 Hz 2380 -1 -1
2021-03-03 06:40:00 29329.8 0.4 Hz 8560 -14 -14
2021-03-05 07:00:00 112426746.52 1 us 8560 -14 -14
2021-03-08 02:50:00 112625015.08 1 us 8560 -14 -14
2021-03-11 08:20:00 113796393.86 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)